Download the latest gradle file from here. Then in your Android Studio goto File->Settings->Build,Execution,...->Build Tools->Gradle. Then In the right side Check the "Use local gradle distribution" and then set the downloaded file as your gradle home. Below, in the Global gradle settings check the Offline Work option.->Click Ok.
DONE

But Even though doing this will let you create a simple android app, you won't be able to import any external libs.